Paper-making machine.



" D. F. SULLIVAN.

PAPER MAKING MACHINE.

APPLICATION FILED SEPT. I6. 1915.

Patented Mar. 28, 1916.

KQQQQY IN V EN TOR, fizz 21d A? Jklzfmzz,

A TTORNE Y.

WITNESS e a inn a e re a a a i lit.

DAVID F. SULLIVAN, 0F HOLYGKE, MASSACHUSETTS.

PAPERJEAKING MACHINE.

Specification of Letters Patent.

lPaten-ted Mai. 2%, 191%..

Application filed. September 16, 1915. Serial No. some.

To all whom it may concern:

Be it known that 1, DAVID F. SULLIVAN, a citizen of the United States of America, residing in the city of Holyoke, county of l-lanipden, and State of h lassachusetts, have invented certain new and useful Improvements in Paperddaking lilachines, of which the following is a specification.

This invention relates to an improvement in paper making machines in which the pulp from the flow box is delivered on to the usual Fourdrinier wire of the machine.

The invention, in general, comprises an apron device located between the outlet of the flow-box and the breast roll over which the l ourdrinier wire passes. Heretotore, it has been the common practice to convey the pulp from the flow-box on to the Fourdrinier wire by means of a fixed apron. In my invention I employ an apron that can be readily adjusted as to its length for the purpose of causing more or less of the water contained in the pulp to flow through or to be retained in the pulp. It is a well known fact that at times the pulp is of such a nature as to cause froth or foam to appear in small specks in the finished paper, which are known iii the art as froth specks.

. These specks can be made to disappear by shortening the apron, this has the effect of causing more water to sift through the wire between the end of the apron and the first slice. the result being to draw these froth specks downward into the body of the pulp where they disappear in the weaving of the fibers of the paper together as a result of the combined action of the transverse and longitudinal motion of the flowing pulp and shake-frame, and the weight of the dandyroll.

it is a well known fact that the quality or texture of the fiber composing the pulp varies in that some retains the water more readily than others, while in other instances the water escapes too readily from the pulp, which is described as free stuff. In the making of heavy paper or use of slow stuff. by shortening tllGflDIOl'l a larger quantity of water is allowed to sift through the wire into the save all from which it then flows into the fan pump and can be used over and over again to assist in the screening operation. In the making of a lightweight paper with free stutl. too much water sifts through the wire leaving the paper only partially formed before it reaches the dandy roll. By extending the apron up to the first slice more water is allowed to pass under the slices and reach the dandy roll, resulting in the formation of a better watermark and the production of paper of finer texture.

Referrin to the drawings-Figure 1 is a longitudinal sectional view showing the flow-box, a portion of the delivery pipe from the screen connected thereto, the controlling gate, the breast roll, and a portion of the Fourdrinienwire and deckle strap; Fig. 2 is a detail view in an end elevation, showing the means for adjustaloly securing the take-up roll on which the apron is wound; and Fig. 3 is a partial plan View of Fig. 2.

Referring to the drawings in detail the flow-box is indicated at 1, the delivery pipe from the screen at 2, and the usual controlling gate or valve at 3, that is operated by the hand wheel 4. The Fourdrinier wire is indicated at 5, and the usual deckle strap at 6. The wire travels in the direction of the arrow 6 which passes over the breast roll 7.

8 indicates the roller on which the apron 9 is secured by any suitable means, as tacking, which is indicated at 16. This apron is understood to extend transversely the width of the machine. The roller 8 is rotatably mounted in the bracket 11 which is suitably secured to the side of the machine by means of the bolts 12. .Secured to the shaft 13 of the roll 8 is a toothed wheel 14. This toothed wheel serves the purpose of locking the roll 8 in any position and in order to accomplish this result a spring 15 having an rip-turned end 15" enters the teeth of the wheel.

16 designates a second apron that is secured to the apron hoard l'l', or floor that extends from the outlet opening of the llowbox to the bTEiz'lfit roll and extends forward a sufficient distance to overlap the passageway 18 in order to prevent the pulp from escapino and flowing downward into this passageway.

The apron 9. as shown in Fig. 1. is drawn out as far as it can he, and, in this position the water that is in the pulp can not escape throu h the wire 5 until after it leaves the end 9 of the same. The first and second slices are indicated at 19 and 20. If the apron 9 is drawn in or rolled on to the roller ll it is evident that more water will escape from the pulp through the wire 5 before it passes the slices, or, in other words, the pulp, after it leaves the second.

slice will be more solid because it contains less water. Whereas by extending the apron up to the first slice more water is allowed to pass under the slices and reach the dandy roll, resulting in the formation of a better watermark and the production of paper of finer texture. In order to roll up or shorten the apron 9 when necessary, the operator simply withdraws the bent end 15 of the springilfi from the teeth of the wheel 14, when he can wind in the apron to any extent as desired and readily lock it again by allowing the spring to snap back into one of the teeth. By carefully adjusting the apron the desired amount of water is allowed to escape or be retained in the pulp as desired and readily lock it again by allowing the spring to snap back into one of the teeth. By carefully adjusting the apron 9 the desired quantity of water is allowed to escape from the pulp through the wire 5, before the stock passes the slices.

As stated above, some grades of pulp permit the contained water to escape from or be retained in the pulp or stock more readily than others, and, as a. result of careful adjustment of the apron 9, the stock, vbefore it passes the first slice 19, can be made to contain the exact quantity of water required in order to produce the best and strongest grade of paper, that is to say, the fibers in the pulp will be woven together properly, at the same time any froth specks will bemade to disappear or drawn into the body of the pulp. The dandy roll, as stated above, also serves to remove all trace of the froth specks. The larger the quantity of contained water in the pulp the better the fibers are woven together by the combined action of the transverse and longitudinal movements imparted to the pulp by the shake-frames as it flows therethrough.

11 indicates a gate that can be swung backward into the position shown in dotted lines in Fig. 3 for the purpose of removing the roll 7 and putting on a wire.

21 indicates the usual elbows or angle irons for the support of the side pieces.

The apron 9 will always be kept in a smooth and straightened out condition by reason of the fact that its forward end engages and rests upon the Fourdrinier wire. and, as it travels beneath this apron it will cause the same to lie flat thereon permitting the pulp to flow in an even stream on to the wire. It is of course, understood that the apron is made of some thin fiexihle.

waterproof material that is impervious to water, as oil cloth.

It will readily be seen from this con- .machine for rotation, means for retaining the roller in afixed position, and a second apron having its free end extending across a portion of the forward end of the first mentioned apron.

2. An apron device for paper making machines, comprising in combination, a roller, means for rotatably supporting the roller between the flow-box and the breast roll, means for retaining the roller in different positions of adjustment, an apron board located above said roller and having a passageway therethrough, an apron attached to the roller and extending through the passageway and resting upon. the forward end of the Fourdrinier wire, a second apron attached to the flow-box and extending over the passagewayfor closing the same, and a short distance onto the first mentioned apron.

3. {in apron attachment for paper making machines, comprising a roller rotatably secured thereto means for retaining the roller in different positions ofadjustment, said means comprising a, toothed wheel secured to the roller and a spring arm having a bent end for engaging the teeth of the wheel. an apron attached to the roller and extending forward in the plane of the upper surfaces of the Fourdrinier wire and engaging the same, a second apron extending over and onto the forward end of the first mentioned apron, as described.

4. An attachment for paper making machines. comprising a platform between the flow-box and the breast roll and having a passageway therethrough. a roller rotatably mounted below the platform. an apron secured to the roller and extending through the passageway and onto the forward end of the platform and Fourdrinier wire, means for retaining the roller and apron in a fixed adjusted position. a second apron secured to the forward edge of the flowbox. and extending forward over the passsageway and lapping onto the first mentioned apron for closing the passageway.

DAVID F. SULLIVAN. 

